Sincerely doubt that. The electorate don't give a shit about it; half we English either support it and the other half just don't care.If a rUk political party (in the event of a yes) agrees to a union after it being the main defence for the No vote they'll be committing political suicide.
Beside, the whole currency noise just reinforces how little regard Westminster holds Scotland in. The entire campaign has been designed to instil fear in the Scots: "you're too small", "you're too weak", "leave and you'll get nothing" It's almost like watching an abusive partner (and Westminster fits the description so well).
Try and evaluate what the Union actually brings to Scots that's positive or hopeful and the answer is: "nothing".